Type-writer ribbon mechanism.



J. J. CHAPIN.

TYPE WRITER RIBBON MECHANISM. APPLICATION FILED SEPT-2.1908.

1,1 66,1 1 1L. Patented Dec. 28, 1915.

1.1 C.HAPIN.' TYPE. WRITER RIBBON MECHANISM.

APPLICATION FILED SEPT. 2. 1908.

Pmmea Dec. 28, 1915.

3 SHEETS-SHEET 2.

mwm 1.,

J. J. CHAPIN.

TYPE WRITER RIBBON MECHANISM. APPLICATION FILED SEPT- 2. 190a.

Patented Dec.28,1915.

3 SHEETSTSHEET a.

JOHNJ. CHAPIN, DETROIT, MICHIGAR ASSIGNUR '10 BURROUGHS ADDING MACHINECOMPANY, OF DETROIT, MICHIGAN, A CORPORATION OF MICHIGAN.

TYPE-WRITER RIBBON MECHANISM.

Mam.

Specification of Letters Pa e.

Patented Dec. 2, 191.5

I Application filed September 2, 1908. -Seria1No. 451,363.

To all whom it may concern:

Be it knoun-that 1, JOHN J. CHAPINI, a

citizen of the' United States, residing at Detroit, in thecounty ofWayne and State of Michigan, have invented certain new and usefulImprovements in Type-Writer B bbon Mechanism, of which the following isa specification.

The present invention relates to mechanism for controlling the inkribbon of a typewriting or likemachine and one object of the inventionis to provide for automat1- cally discontinuing the ribbon feed during atabulating advance of the paper carriage. Another object isto provide asimplified form of ribbon vibrator for a front-strike typewriter and athird object is to provide improved means for transmitting movement fromthe spring drum to the ribbon shaft.

With these and incidental objects in view the'invention consists incertain novel features of construction and combinations of parts, theessential elements whereof'are recited in the appended claims and apreferred'form of embodiment of which is described in detail hereinafterand fully illustrated in the accompanying drawings forming a part ofthis specification. Of said drawings Fi ure 1 represents a partialtopplan View a typewriting machine having the improvements of thepresent invention embodied therein; Fig. 2 is a fragmentary sectionalelevation of the machine, the view being taken a short distance insidethe left-hand frame-piece; Fig. 3 is a similar view, the View. beingtaken farther to the left; Fig. 4c is a sectionalized top plan view ofribbon-driving mechanism;

Fig. 5 is a cross-sectional detail taken on the line 5'5 of Fig. 4; Fig.6 is a horizontal view of the ribbon vibrator and guide; Fig.

7 is a perspective view of a ribbon vibrator;

carry beveled gears 9 and 10 adapted tov mesh with similar gears 11 and12 secured to a shaft 13 which is. mounted to slide and rotate insuitable bearings on the frame work, the relation between the beveledgears being such that the intermeshing pairs alternately engage. Agrooved collar 14: on the shaft cooperates with a spring clip 15 on theframework to hold the said shaft in its two differentpositions. Motionis transmitted to said shaft from the carriage spring barrel 16 throughthe following described train of mechanism: Aratchet wheel 17 secured tosaid barrel engages with a springpressed pawl 18 pivoted upon a largegear wheel 19 concentric with the barrel but loosely mounted relativethereto. This gear wheel meshes with a smaller gear wheel 20 supportedby a suitable bracket20 and held from retrograde movement by a gravitydog 21 (Fig. 8). This smaller gear wheel is se cured to a. shaft 22which carries a worm 28. The latter meshes with a worm wheel 24:secured-to a sleeve 25 loosely mounted upon a sleeve 26 which is securedto the the sleeveof a finger 29 secured to and projecting-from a bracketin which the spring drum is mounted. A pin 30 secured in the outer oneof the two flanges 27 slides through an opening in the flange of asleeve 31 loose on the shaft13 but movable longitudinally therewith.This sleeve 31 abuts the sleeve 26 at one end and at the other endcarries a ratchet wheel 32 (Fig. 5). This ratchet wheel is engaged by apawl 33 pivoted upon the flange of a collar 34 secured to the shaft 13,the said pawlbeing spring-pressed into engagement with the ratchet. V

Ttwill be obvious that through the abovedescribed connections theturning of the spring barrel in one direction, to-wit, the direction inwhich it turns when the carriage is being drawn to the left, will rotate"the shaft 13 and turn one -'or the other of the tained through thesliding engagement of the pin 30 with the flange of the sleeve 31 sothat the worm and worm gear, remair constantly in mesh. The shaft 13 maybe turned by hand without affecting the driving connections with thedrum, the pawl 33 such case simply clicking over the ratchet 32. ,Forthe purpose of turning the ribbon sp ools by hand the shaft 13- isequippedwith a handle crank 35, as shown in Figs. 1 and 4.

In order to suspend advance or feed of drum from the ribbon feed shaft13 as anincident to a tabulating'operation. In Fig. 2. tabulatin'gconnections are shown, the

I same comprising a key lever 49 pivoted intermediate its ends andcarrying in rear of its pivot a supplemental lever 41 alsopivotedintermediate its ends, said supplemental lever being drawn down by aspring 42 on its forward side. A latch 43 pivoted to the frame-work anddrawn rearwardly by a s rin 44' normall en a es over a in or stud 45on'said lever 41-, preventing such' lever being carried up bodily by thelever 40 .when the key on the front end of the latter is depressed. Therear end of said lever 40 is formed with a depending extension 16carrying a stud 4-7 to co-act Witha cam-rise 48 on the latch 43so thatas the tabulating key reachesthe end its downward movement'the latch 43-w1ll be disengaged from the stud 15andthe spring 42 which'has meantimebeen put under tension will there-- upon throw up the rear end ofthelever 41 its conical head 68 to act with a. camming efiect upon thefinger 69, thus disengaging the pawl 18 fr: n the ratchet 17 therebydiscontinuing the ribbon feed. When the tabulator key rises of coursethe rock shaft 52 is'restored .to normal and the thrust rod retreatspermitting the ratchet to re'engage the pawl. Depression of thetabulator.,key setsa suitable stop to limit the movement of thecarriage- Passing now to the ribbon vibrator this is made of a singlepiece of sheet metal comprising a shank 80, (Fig. 7) divergent arms F 81springing from a slightly ofi-set portion 80' of the shank, verticalextensions 82 of said arms and doubled-over integral portions 83 betweenwhich and the portions 82 the ribbon is confined. Small led cs 84: arebent forward at the upper edges 0 the horizontal portions of thebranches 81 to support the loweredge of the ribbon on flat surfacesavoiding wear on the edge of the -ribbon.. With this construction theribbon is properly held in front "f the platen with the'minimum of metalabove the same so thatv the work is not at all obstructedby the presenceof the vibrator. The latter is guided in its movements up and down byaportion of a type bar centering guide 85 vertically extending parts ofthe latter being grooved along opposite sides to receive clips against astop stud 49 on the lever40. A* 86 formed out of the vibrator'metalspringrod 50 connects the rear end of said lever 41 mg from opposlteedges of the same ust with an arm 51 loose upon a rock shaft 52, thelatter extendin in rear of the spring drum.- This rock shaft has aflixedto it an angular arm 53 connected with said arm- 51 by 'a' comparativelystrong spring 54 and having a stud 55 which engages under said arm 51.Thus it will be seen that depression pf thetabulator key will result insaid shaft 52 being ro'cked. An arm 56, secured to said rock shaft andprojecting forward, carries a roller 57 engaging under a flange 58 ofthe escapement rack 59, the latter. being carried by pivoted arms 60 andnormally engaging an escapement'pinion. 61. The rocking of the shaft 52by'depression of the tabulator key is utilized as a means-fordiscontinuing the ribbon feed. Thus there is secured to said shaft ashort downwardly-extending radial arm 63 having a spherical enlargement64 at its end for operating against one l so:

end of a'rod 65 which slides through a tubular shaft 16 supporting thespring barrel. This rod issrew-threadedat its rear end to receive a nut66 which confines a spring and over the conical head 68." It will be"seen that the rocking of the tabulator shaft, 52 will thrust the rod 65forward and cause above the offset 80' and projecting forward and thencetoward each other.- Up. and down movement of the vibrator is producedthrough appropriate connections with the letter-spacing mechanism. Thusthere is jointed to the lower extremity of the vibrator the forward endof a lever (Fig. 3)

which is pivoted intermediate its ends to a' bracket 91 and atits rearend embraces a screw-threaded rod 92 between adjusting nuts 93. Said rodis connected with a link 94 which is held upward by a spring 95 andcoupled to a bell crank lever 96. This bell crank lever is connectedby alink 97 to an tip-standing arm 98 of a universal bail .99 running underthe key levers.

It will now be seen that the constructions above described are wellcalculated to ful- -fil the objects primarily stated though it is to beunderstood that such constructions are susceptible of modificationwithin the scope of the invention.

What I claim .is: j 1

1. In a machine of the character described,

"?-.t he combination of a )a Jet carriage a spring drum and connectionsfor moving said carriage, ribbon carrying means. gearing applied to thelatter and including a member. adjacent the spring drum, ratchet andpawl connecting the latter and saidmember, a tabulator key andconnections. and means for throwing out the ratchet and.

said ratchet wheel, a tabulator key and con nections includin a rocksna'ft with a radial pro cctiOn, and a slide rod extending axially ofthe drum and acted upon by said radial projection and in turn actingupon said pawl to disengage it from the ratchet wheel.

3. 1:1 a machine of the character described, the combination of a papercarriage, a spring drum and'connections for moving said carriage, ribboncarrying means, gear- .ing applied to the latter and including a memberconcentric with. the spring drum,-a ratchet wheel adjacent said member,a spring held pawl on the latter engaging said ratchet Wheel, and havinga cam finger, a tabulator key and connections including a rock shaftWith a radial projection, and

a slide rod extending axially of the drum and acted upon by said radialprojection and having a conical head engaging the cam finger of thepawl; substantially as and for the purpose described.

iRibbon feed mechanism comprising spools and their gears; a rotatableslide :\shaft carrying gears .to mesh alternately vwith; correspondingspool gears; a sleeve loose 'on the shaft and held from movementlongitudinally thereof and having a Worm gear; a worm permanently inmesh With said gear; means for driving the worm; a second sleeve looseonthe shaft but movable longitudinally therewith and rotatably en gagedwith the first sleeve; and-a ratchet and pawl driving cd nnectionbetween the last-mentioned sleeve and-the shaft.

din a machine of the class described, a:

,onepiece ribbon vibrator comprising a shank and spaced fingers doubledover to form ribbon guides and bent 0Y6! portions laterally offset fromthe fingers constituting ledges to support the ribbon edgen'ise.

In a machine of the class described, a one-piece ribbon -vibratorcomprising a shank, divergent branches having upstanding fingers doubled:over to form ribbon guides, the divergent branches having bent overportions ofi'set laterally from the fin gersconstitnting ledges toextend under the ribbon.

7, In a typewriting machine, the combination of a type bar centeringguide vertically grooved inopposite sides, and a one piece ribbonvibrator haringa shank with angular clips to engage the grooves in thetype-bar guide and arms in continuation of the shank.

8. In atypewriting machine, the combina tion of a typebar centeringguide vertically grooved in opposite sides, and a one-piece ribbonvibrator having a shank With angular clips to engage the grooves in thetype bar guide, and arms in continuation of the shank With fingers'bentover toward the plane of the engaging portions of the clips.

9. In a machine of the character described, the combination of a papercarriage, a spring drum and connections for moving said carriage, ribboncarrying means, gearing applied. to the latter and including a memberconcentric With the spring drum, clutch connections between the springdrum and said concentric member, a tabulator key and connectionsincluding a rock shaft with a radial 131O](-&Ct1011 and a slide rodextending axially of the drum and acted upon by said radial projectionand in turn controlling said clutch connections.

JOHN J. CHAPIN.

Witnesses J. G. Vxnomrr, R. S. Mnnimrr.

@bpies of this =patent may-be obtained for five cents each, byaddressing the Uommissioncr of lPatents.

' Washington, I) C.

